Bed motion



F. w. sx-:YBOLD 2,187,758

BED MOTION Filed July 7, 1938 5 Sheets-Sheet 1 www y 4Jam. 23, 1940. F.w.v sEYBLD BED MOTION Filed July '7, 1938 5 Sheets-Sheet 2 l v I L 9/Jan. 23, 1940.

F. w.vsEYBoLD 2,187,758

BED MoTroN FiledJuly v, 1938 5 snets-sheet s Siwa/rm mma, M, M'vm@HQ/man Jan. 23, 1940. l F. w. sEYBoLD 2,187,758

BED MOTION Filed July '7, 1938 5 Sheets-Sheet 4 7:"9. 5. Zzgl 7 /af fifa35 Jan. 23, 1940. F. w. sEYBoLD 2,187,758

BED MOTION Filed July '7, 1938 5 Sheets-Sheet 5 Patented Jan. 23, 1940UNITED .STATES fPATENT oFFicE 19 claims.: (o1. u zs) This invention.relates to .reciprocating bed motions or the like, and more particularlyto mechanisms of this'characterespecially adapted to be-embodied .inprinting presses'of the at bed and cylinder type. Y

The general object ofthe invention is to provide a novel and improvedreciprocating bed mo-v tion-by means of which a bed or similar carriagemember may be oscillated through a complete l0 cycle, the greaterportion .of the movement in at least one direction k.being atsubstantiallyv constant. speed.

In attainingthis object, there is employed a train of driving gearingWhichfconnects the bed with a suitableisource of power, and which is`constantly in mesh, thus insuring a positive driving connectionwat alltimes. This' arrangement makes possible the elimination of all cams,gates, latches, locks or any intermittently operating reversing'gear;only such partsbeing .used in the construction of thedevicewhich' can bereadily produced on standard machine tools at 10W cost. It, isl a. moreparticular object of the invention to provideareciprocating bed motionwhich comprises a systemof planetary-gearing including adriving'elementcarried by a planet gear and given a cyclic movementduring operation, which by suitable vmeans is transformed into`oscillatory rectilinear motion and applied to the bed, The arrangementand proportionsof the parts are so selected as to producela cyclicmovement of the driving element which will yield `as long a period aspossible `of nearly constant velocity in the stroke of the bed, andfurthervnovel means are :t3 provided for applying. anoscillatorymovement E to the sun gear at certain points during the-cycle ofmcvementof the driving gearing whereby a longer period ofy more nearlyuniform speed will be produced. 4,9 In .itsl preferred'forms,the=invention contemplates the provision fof' planetary gearing whichwill develop, ina .crank pin yor- 'other intermediate driving element,ya cyclic vmovement having the generalcharacteristics of .either ahypotrochoid ,3 or an apitrochoid, but both the 4orbit and angularvelocity of the crank element are modiiied by means of a novelarrangement of gearing Which rocks orv oscillates the otherwisestationary sun .gear about its axis, this serving to prolong the ,5&0rperiod cf substantially constant velocity-of the bed and to render itmore uniform.

As previously pointed out, the present inven tion has particularvadaptation to the printing It has long been recognized as desirable,

ing the vprinting period of a press of the type described, when thereciprocating type bedand the rotary impression cylinder arer in rollingcontact, to have these members of the printing couple move at a uniformlinear velocity so as to aid in securing the proper registry and prevent51 the marring of the impression. Tins desired condition also rendersunnecessary the awkward and diilicult alternative of rotating theimpressionpcylinder ata-n irregular rate toadaptv it to any non-uniformmotion ofthe bed. `1o

A reciprocating bed actuated by a sliding crosshead or yoke driven by asimple crank-arm, as in the case of the familiar Scotch yoke, would.Ihavea linear` velocity which varies continually, attaining a maximum atmid-stroke and equallo ling zero at points of reversal at the ends ofthe printingand return strokes. This movement is one ofsimple harmonicmotion, the general Vevelocity equation of which is 26 V=wR cos 0 `where0 is' the angle the driving crank makes With the horizontal. Thevelocity ratio curverrepresenting the relation of the velocity of thebed and the constant vlinear Velocity of the crank pin .2 5 would be, inthat case, of course, thefamiliar sinusoid or sine curve. The problem,therefore,

is to produce a modified harmonic motion, which may be represented by acurve havinga atter loop'than the' sinuso-id, indicating a more nearlyconstant speed during at least the greater portion l of the printingstroke.

.driving the bed during different portions of its printing and returnstrokes and also for effecting thereversal of the bed at the ends of the,4Q strokes; others have usedgrooved cam members or similar difcultlymyachinable elements in the driving train; and still others haveapproximated the attainment of the desired conditions by the developmentin the bed of a motion Which is the projection upon a straight line ofthev cyclic movement of adrive element developed by an ordinaryplanetary system.

v Theexpedient last cited has the advantage of eliminatingv certain. ofthe irregular parts to which reference has been made, but it falls quiteshort of .providing a uniform velocity period of any considerableduration or accuracy during the cycle.

" All'v of these irregularities` and deciencies are 55 eliminated by thevarious provisions of the pres ent invention, as will be set forth ingreater detail in the following specification, which together with theaccompanying drawings disclose two embodiments of the invention whichare exemplary only and not to be interpreted as limiting the scope ofthe invention which is defined in the subjoined claims.

In the instant specification, the two species of the invention disclosedprovide the constant velocity periods in both the printing and returnportions of the cycle. Two other species within the generic scope of theinvention are disclosed in my copending application Serial No. 217,995led July 7, 1938, contemporaneously with this one; those speciesproviding the constant velocity period only during the printing stroke.

In the drawings:

Figure l isv a vertical transverse sectional View through a bed andcylinder printing press embodying the principles of the invention;

Figure 2 is a fragmentary horizontal sectional view taken on line 2-2 ofFigure l;

Figures 3, 4 and 5 are fragmentary longitudinal vertical sectional viewstaken on lines 3 3, 4-4, and 5-5 respectively of Figure 1;

Figure 6 is a fragmentary view in horizontal section taken on line 6-6of Figure 1;

Figure 7 is a view similar to Figure 1 but illustrating an alternativeembodiment of the invention;

Figure 8 is a diagram illustrating the movement and relationship ofcertain parts of the mechanism for oscillating the sun gear of either ofthe illustrated embodiments;

Figure 9 is a diagram of the movement and relationship of the essentialelements of the planetary system in the embodiment illustrated inFigures 1-6 inclusive;

Figure 10 is a similar diagram based on the embodiment shown in Figure'7;

Figure l1 is a graphical representation of the velocity ratios duringthe cycle of movement of the driving crank element; and

Figure 12 is a diagram of the planetary system of the rst describedembodiment on an enlarged scale, furnishing a graphic explanation of theelements of the velocity and displacement equations involved.

In presenting the detailed specification of the invention, themechanical structure and its operation will be described and then theunderlying theoretical considerations will be explained and theirmathematical basis set forth.

In Figures 1-6 inclusive of the drawings, a printing press of thetwo-revolution, flat bed and cylinder type is indicated generally by thereference numeral IU. As to be inferred from the designation of thepress, the impression cylinder II makes two revolutions while the typebed I2 is making one oscillation.

The bed I2 is of course mounted for rolling contact with the impressioncylinder II during the printing stroke. 'Ihe means for supporting thebed during its oscillatory movement comprises the conventional rollersI3 which are disposed between the tracks I4 carried respectively by thebed and portions of the press frame I5. The bed is guided by means ofthe bed rack I6 and the gibs I! which are suitably supported from thebed, and which are arranged for sliding contact with the guideways I8and I9 provided on the press frame.

The impression cylinder II is driven from the large main driving gear 20which is rotated from any suitable source of power, this gear 20 beingkeyed to the main drive shaft 22 which is rotatably mounted in thebearings 23 provided in the frame I5. The means for rotatably supportingthe inner portion of this shaft will be described in connection with thebed driving mechanism. The large gear 2l) meshes with the impressioncylinder gear 24 which is carried upon the end of the impressioncylinder shaft 25 which is suitably supported in the bearings 26 carriedby the press frame.

The mechanism for driving the bed I2 will now be described; thismechanism being arranged to oscillate the bed through a complete cyclewhile the impression cylinder is making two revolutions, and also beingadapted to move the bed at the same constant linear speed as theimpression cylinder during the printing stroke. Upon the inner end ofthe main drive shaft 22 there is keyed as at 3| the crank disc 30 whichis provided with the bearing bushing 32 in which the crank member 33 isrotatably mounted. 'I'he crank4 member 33 comprises the intermediateshaft portion 34 upon one end of which is formed the eccentric crank pinportion 35 which through certain operative connections transmits thedriving force to the bed. Upon the opposite end of the crank member 33there is provided the planet pinion 36, all of these portions of themember 33 being formed integral if desired. The planet pinion 36 mesheswith, and is adapted to roll about the oscillatable sun gear 40, thissun gear being secured as by means of bolts 4I to the member 42. 'Ihismember is provided with a tubular portion 43 freely rotatable upon theshaft 22 and separated therefrom by means of the bearing bushing 44. Theportion 43 also serves to support and guide the shaft 22 for rotationwithin the bearing boss 46 formed on a portion of the frame I5. Themember 42 is provided with a slotted arm 45 as very clearly shown inFigure 5 of the drawings.

A gear 48 is keyed as at 49 to an intermediate portion of the main shaft22 and meshes with a smaller gear 50 carried by the stub shaft 5Irotatably carried in the boss or enlargement 46 of the frame I5. Uponthe inner end of the stub shaft 5I there is formed the eccentric crankpin 55 which carries a block 56 adapted to move within the slot 51 ofthe slotted arm 45 of the member 42. It will thus be seen that as thecrank pin 55 rotates it imparts an oscillatory movement to the member 42which as described is rigidly secured to the sun gear 40, and thisoscillation is transmitted to the sun gear and thus modifies the cycleof movement of the main driving crank pin 35 and alters the ultimateeffect on the bed.

The means for transmitting the movement of the driving crank pin 35 tothe bed I2 includes the following mechanism. The pin 35 carries a block58 which is adapted to slide within the vertical slot 59 formed in thehorizontally sliding cross-head member 60. The member 60 is providedwith suitable bores adapted to receive the two horizontal shafts 62 and64 by which the cross-head is guided; these shafts being mounted attheir ends in the portions 65 formed on the frame I5. A stub shaft 68 iscarried upon the upper central portion of the cross-head 60 and upon itsprojecting end a traveling gear T0 is rotatably mounted, this gearmeshing with the bed rack I6 and also with the stationary rack 'I2 whichis secured to and is supported by the bracket portion 'I3 of the frameI5. It will be readily seen from this arrangement that the travvellin'glgearA kseryesto lvdouble the movement'cf the 'cross-head as itis'appliedf to the bed I2. 'The sun geardllf has twice as many teeth asthe planet gear 36 and the gear 48 of the sun gear`r 'oscillating ytrainhas three times thenumber of teeth 'as the pinion 502 Also, iin theinitial setting of the planetary and .modifying systems, when lthe gear36 is vertically above the 'gear Ml', the cranklex-tends downwardly.'and the modifying crank 55 is l'lorizontalv andextendsf-inward'- lytoward the center-of the shaft 22..

Referencel'may now be hadftov Figures 9v and 'l2 of the drawingswhichcomprise'fdiagrarnsiof .the planetarysystem and `its `movements`without beneto therectifying or'inodifyinggearing 48, 5U. 'The center ofthe shaft-.Nuis indicated at YO and theperiphery of the sun gear4lill-about which the pinion .3o rollsis indicatedat B:. The

length'of the crank arm? of thecrankpin '35 is designated C. UnderAthese conditions, asl the planet pinion 36 rolls about the sun'gear 40,the crank pin 35 generates afprolate epitrochoid indicated at A. Bymeans ofthe pinand slot connection with .thefcross-head 60 themotiontransmitted to the cross-head by the crank pin-35 is the projection'ofthe motion-of thecrank pin :upon 'the horizontal line passing throughthe center O, the' displacement 'of this :motion vbeing indicated by S.

The displacement equation for this vmotion may be expressed asfollows:

S'czrsm @fc sin (Mii) e 1) this equation expressing the ordinate of `theepitrochoid which, of course, is the path `generated by a point ,on theradius of axcircle rolling upon Ithe exterior periphery of anbasecircle.

the length of the crank armv 35 being 57A@ or 5.7%. of the length of thecrank disc 3D.

. The velocity ratio equationis obtained by dif ferentiating thedisplacement equation` with re"- spect to time and is found to be l v=1oo coso-nimeer 3) where w is the angular velocity ofthe-crank disc 39.

This equation is represented graphically -by the solid line curve I inFigure l1 in which the velocity ratios of the disc- 3i?V to the crankpin $5 are plotted against the angular displacements of the crank disc.The acceleration ratio equation is represented by the curve II.

It will bev seen that' the velocity ratio curve yields twoportions whichare nearlydevel but which do not represent a velocity which is constantenough for the purpose during the printing However, by means of therectifying gearing i5-55 which appliesthree smail oscillations to thesun gear iduring .a given cycle, the velocity ratio curve may be leveledas indicated by the dotted line a, .thus .providing a relativelyprolonged period of 1.substantially uniformtveloci'tywhich yisapplied tothe bed l2 during the printing stroke. It` will be noted also thatl thiscurve is symmetrical and that the same uniform motion is applied duringthe return stroke. Referring. now to Figure 8 of the drawings the effectof the rectifying-gear train upon the motion of the crank pin 35 will bedescribed. In this ligure d is the distance between the centers of thegears 4B and 50; R2 equals the length of the crank 55; a equals theangle the slotted arm do makes with the line connecting the centers ofgears ilrand 50 or as developedgraphically in the diagram of Figure 8,the kangle a may be expressed by L RZ'SII 30 a-arc Land- R2 COS 36 (4)which is the angle the sun gear is being oscillated by the crank pin 55.Since the sun gear vl0 is twice the size of the planet pinion 36, thecrank 35 will turn through an angle 2a, and the displacement of thecross-head in the final mechanism can be expressed by S=100 sin 0-5.7sin (3H-2a) (5) I' R2 sin 30 S-lOOsm 6 5.7 sin (30 2 arc cand R2 cos 30(6 By making the compensating crank arm R2 of suitabIelength, thevelocity of the type bed can be made practically uniform duringapproximately 58% of the stroke of the bed which is quite adequate andpractical for the operation'of -a two-revolution, flat vbed printingpress. -v `,Referring now-toFigure 7 of the drawings in whichamodicationof the previously described- ,arrangement is shown, the'sarnerefer-encecharlacters are applied` as in the prior construction with theaddition of primes. Thus," the imlpression cylinder Il' rolls-,upon theoscillating bed- 12.', which issuD-portedupon suitable rollers I3 andcarries the bed rack l.. ,The .main driving shaft 22 is carried in.bearings in the Aframe I and has the crank disc 30,. keyed there- 4toat'its inner end. Thecrank disc rotatably carries the crank assembly 33which includes the driving crank pin 35 and the planet Apinion 35', thelatter meshing with the internal sungear dll which comprises the ringgear portion Mia secured to the periphery of the wheel or disc Mlblas bymeans of the bolts Mic. The internal sun gear 49 is secured to theoscillating member e2' as by means of the bolts 4l. The member 42 isprovided with a slotted arm just as .in the case previously describedand is oscillated by exactly similar means which includes the gear .48,keyed as at 49 to the shaft 22'.

The crank pin 35 carries the block 58 which `moves. in the verticalslots 59 formed in the cross-head 68' which is mounted for horizontal.oscillation in the same way as described in the previous embodiment.The cross-head 6D also carries the gear i0 which meshes with the bed.rack I5' and the stationary rack 12.

The'motions developed in this embodiment are depicted in the diagram ofFigure of the drawings in which the periphery of the internal sun sgear4d' is represented by the reference character Brumm which the planetpinion 35 rolls. The

path described by the crank pin 35' is in this caserhowever, a prolatehypotrochoid indicated at A2. The crank arm of the crank 35 is indicatedLatC..

In this embodiment, since the rotation of the planet pinion in the caseof the internal gear construction is opposite in direction to that ofthe external gear construction, the expression Mil of the generalEquation (l) becomes M-l under these circumstances and the gear ratiobeing 4:1 the displacement equation as modied by the compensatinggearing becomes However, since M=4 in the case of the internal gear andM=2 in the case of the external gear, the final values of the equationsin the two cases are the same, and thus both constructions yield thesame motion in the type bed. The curves Ia and II in Figure ll representthe velocity and acceleration ratios in this embodiment also.

It will thus be seen that there has been provide-fl by the presentinvention novel mechanism for developing a projected motion in the bedof a printing press of the type described which is derived from thecyclic motion of a crank element appropriately modied or rectified byoscillation of the sun gear to yield the desired period of uniformvelocity during the greater portion of the printing stroke.

It is understood that various changes and modifications may be made inthe embodiments illustrated and described herein without departing fromthe scope of the invention as defined by the following claims.

The phrase without retracement as employed in certain of the claims isused, as in my prior Patents Nos. 2,082,183 and 2,082,184, to indicatethat the driving element moves continuously in one direction along itsclosed orbit and never retraces its path therealong duringany singlecycle of movement.

Having thus described my invention, what is claimed as new and desiredto be secured by Letters Patent is:

l. A bed movement of the type described in which the bed during itsworking and return strokes is reciprocated in a plane, comprising thecombination with the bed and means for supporting the same for planarmovement, of a driving element, a member rotatable at a constant angularvelocity for moving said driving element without retracement along acyclic path, transmission means for maintaining a constant oper- 4ativeconnection between said driving element and said bed, and meansoperatively associated with said member for introducing certainvariations in the angular velocity of said driving element, whereby saidbed is caused to move at a substantially uniform linear velocity duringportions of its cycle oi reciprocation.

2. A bed movement of the type described in which the bed during itsworking and return strokes is reciprocated in a plane, comprising thecombination with the bed and means for supporting the same for planarmovement, of a driving element, means rotatable at a constant angularvelocity for moving said driving element without retracement along acyclic path which is symmetrical about the center of rotation of saidmeans, transmission means for maintaining a constant operativeconnection between said driving element and said bed, and means drivenby said second named means and operatively connected with said drivingelement for introducing certain variations in the angular velocity andcyclic path of said driving element, whereby said bed is caused to moveat a substantially uniform linear velocity during substantial portionsof its working stroke.

3. A bed movement of the type described in which the bed during itsworking and return strokes is reciprocated in a plane, comprising thecombination with the bed and means for supporting the same for planarmovement, of a driving element, means rotatable at a constant angularvelocity for moving said driving element without retracement along acyclic path which is symmetrical about the center of rotation of saidmeans, transmission means for maintaining a constant operativeconnection between said driving element and said bed, and means drivenby said second named means and operatively connected with said drivingelement for introducing certain variations in the angular velocity andcyclic path of said driving element, whereby said bed is caused to moveat a substantially uniform linear velocity during substantial portionsof its working stroke, the path of said element being a prolateepi-trochoid modified by said last named means.

4. A bed movement of the type described in which the bed during itsworking and return strokes is reciprocated in a plane, comprising thecombination with the bed and means for supporting the same for planarmovement, of a driving element, means rotatable at a constant angularvelocity for moving said driving element without retracement along acyclic path which is symmetrical about the center of rotation of saidmeans, transmission means for maintaining a constant operativeconnection between said driving element and said bed, and means drivenby said second named means and operatively connected with said drivingelement for introducing certain variations in the angular velocity andcyclic path of said driving element, whereby said bed is caused to moveat a substantially uniform linear velocity during substantial portionsof its working stroke, the path of said element being a prolatehypotrochoid modified by said last named means.

5. A bed movement of the type described in which the bed during itsworking and return strokes is reciprocated in a plane, comprising thecombination with the bed and means for supporting the same for planarmovement, of a driving element, means rotatable at a constant angularvelocity for moving said driving element without retracement along acyclic path which is symmetrical about the center of rotation of saidmeans, means driven by said second named means and operatively connectedwith said driving element for introducing certain variations in theangular velocity and the cyclic path of said element, transmission meansmaintaining a constant operative connection between said element and thebed, said transmission means adapted to develop a projection of themodified cyclic motion of said element upon a line extendinglongitudinally of said bed and transmit it to the bed, the motionimparted to the bed having a period at substantially uniform velocity,which period comprises the greater portion of one stroke of the bed.

6. A bed movement of the type described in which the bed during itsworking and return strokes is reciprocated in a plane, comprising thecombination with the bed and means for supporting the same for planarmovement, of a driving` element, means rotatable. at a conf Anamed meansand operatively connected with said driving element for introducingcertain regularlyv recurring variations in the angular velocity and thecyclic path of said element, transmission means maintaining a' constantoperative connection between said element and the bed, said transmissionmeans adapted to develop an oscillatory motion which is a projection ofthe modied cyclic motion of said element uponl a diameter of the cyclicpath of said element, to amplify said projected motion, and to apply thevresultant oscillatory motion to said bed, the

.motion imparted to the bed having a period at substantially uniformvelocity, which period-comprises the greater portion 'of one stroke ofthe A7. `A bed movement of the type describedin which the bed during itsworking and return strokes is reciprocated in a plane, .comprising thecombination with the bed and means for supportingthe same `for planarmovement, of a ldriving element, means rotatable at a constant Aangularvelocity for moving said drivingvelement without retracement along acyclic path lwhich -is symmetrical about the center of rotation of saidmeans,` means operatively connecting said driving element with said rstnamed means and comprising a planetary system including a sun gear and aplanet gear, means actuated by said second 'named means for oscillatingYsaid sun gear during the cycle of movement whereby the angular velocityof said driving element is varied during its cycle to introducecorresponding variations in the motion of the bed, and transmission.means maintaining a constant operative connection between said elementand said bed.

8. A bed movement of the type described in which the bed during itsworking and return strokes is reciprocated in a plane, comprising thecombination with the bed and means for supporting the same for planarmovement, of a driving element, means rotatable at a constant angularvelocity for moving said driving element Uwithout retracement along acyclic path which is symmetrical about the center of rotation of saidmeans, means operatively connecting said driving element with saidsecond named means and comprising a planetary system including a lsungearand a planet gear, means actuated by said second named means for.oscillating said sun gear during the cycle of movement whereby theangular velocity of saidA driving element is varied during its cycle tointroduce correspond- ,ing variations in the motion of the bed, andtransmission means maintaining a constant operative connection betweensaid elements and said bed, said transmission means comprising alslidingcross-head having a pin and slot connection .with said driving elementand carrying a trav- 'elling gear, which meshes with a rack on said bedand with a iixed'k rack on said supporting means..

9. A bed movement of the type described in 4porting'the same for planarmovement, of driving means rotatable at a uniform angular velccity, a.planetary system including a sun gear mounted for limited oscillationabout its axis,

and a planetgearxadapted to be rolled 'about said ried by saidplanetvgear and means operativelyv connecting said crank pin with'said `bedand including a pin and slot connection, means also actuated by .saiddriving means for periodically oscillating sai-d sun gear, wherebycertain variations are introduced in the normal angular velocity andcyclic orbit of thecrank pin produced by said planetary system, so thata prolonged period of motion ofsubstantially uniform linear velocity .isproduced in the movement of said bed. v

;l0. A bed movement of the type described in which the bed during itsworking and return strokes is reciprocated in a plane, comprising thecombination witlrthe bed and means for supporting the same for .planarmovement, of a` mountedonv said supporting means for oscillatv ingmovement' longitudinally of said bed, 4a travelling gearrotatablymounted on said crosshead and meshing with both said bed rackand said stationary rack, a slot formed in said crosshead, a crank pinadapted vto move along a closed cyclic orbit and, by engagement withinsaid slot, to produce in said cross-head a rectilinear oscillation whichis'fthe projection of said cyclic motion upon one ofthe diameters of itsclosed orbit, means `for generating said cyclic movement in said crankpin comprising a planetary system which includes asun gear and a planetgear adapted. to roll about said sun gear, said crank pin being carriedby said planet gear at a point spaced from its center,n means forrolling said planet gear at a. uniform angular velocity and means forperiodically oscillating said sun gear about its airisV during the cycleof movement.

11. A bed movementoi the type described in .which the bed during itsworking and return ion rotatably carried by the free end of said crank,a sun gear about which said planet pinion is adapted to. roll, a crankpin carried by ysaid pinion at a pointspaced yfrom its center, andtransmission .means for applying the movement said drive shaft, anothergear rotatably mountsun gear whereby the latter maybe oscillatedperiodically during the cycle of movement of the .bed motion to modifythe motion developed by the crankpin and transmitted to the bed, wherebythe bed is caused to move at a substantially constant linear velocityduring the greater lpor- .tionl of vat leastV one of. its strokes,

l2. A bed movement of the typev described in which the bed during itsworking and return strokes is reciprocated in a plane, comprising theicombination with the bed and means for supyof said crank pin to thebed, a gear secured to ed insaid supporting means, and a crank con-.nection rbetween saidlast named gear and the porting the same forplanar movement, of a` main drive shaft adapted to be rotated at auniforma-angular velocity from a suitable source of power', a crank onsaid drive shaft, a planetl piniony rotatably carried l by the free endof said crank', a sun gearconcentric with said shaft about lwhich vsaidplanet pinion is adapted toA roll, a

crank pin carried by said pinion at a point spaced from its center, andtransmissionI means includ'- "ing a. sliding cross-head having a pin andslot connection with the crank pin for applying the movement of saidcrank pin to the bedpa gear secured to said drive shaft, another gearrotatably mounted in said supporting means, a crank pin carried by saidlast named gear, a carrier for oscillatably supporting said sun gear,and a connection between said last named crank pin and said carrier foroscillating the same, whereby the bed is caused to move at asubstantially constant linear velocity during the greater portion of atleast one of its strokes.

13. A bed movement of the type described in which the bed during itsworking and return strokes is reciprocated in a plane, comprising thecombination with the bed and means for supporting the same for planarmovement, of a main drive shaft adapted to be rotated at a uniformangular velocity from a suitable source of power, a crank on said driveshaft, a planet pinion rotatably carried by the free end of said crank,a sun gear concentric with said shaft about which said planet pinion isadapted to roll, a crank pin carried by said pinion at a point spacedfrom its center, and transmission means including a sliding cross-headhaving a pin and slot connection with the crank pin for applying themovement of said crank pin to the bed, a gear secured to said driveshaft, another gear rotatably mounted in said supporting means, a crankpin carried by said last named gear, an annular gear carrier surroundinga portion of said drive shaft, relatively rotatable therewith, andrigidly secured to said sun gear, a slotted arm on said carrier, withinthe slot of which said last named crank pin is engaged, whereby said sungear is periodically oscillated during the cycle of movement of the bedmotion, and whereby the bed is caused to move at a substantiallyconstant linear velocity during the greater portion of at least one ofits strokes.

14. A bed movement of the type described in which the bed during itsworking and return strokes is reciprocated in a plane, comprising thecombination with the bed and means for supporting the same for planarmovement, of a main drive shaft adapted to be rotated at a uniformangular velocity from a suitable source of power, a crank on said driveshaft, a planet pinion rotatably carried by the free end of said crank,an externally toothed sun gear about which said planet pinion is adaptedto roll, acrank pin carried by said pinion at a point spaced from itscenter, and transmission means for applying the movement of said crankpin to the bed, a gear secured to said drive shaft, another gearrotatably mounted in said supporting means, and a crank connectionbetween said last named gear and the sun gear whereby the latter may beoscillated periodically during the cycle of movement of the bed motionto modify the motion developed by the crank pin and transmitted to thebed, whereby the bed is caused to move at a substantially constantlinear velocity during the greater portion of at least one of itsstrokes.

15. A bed movement of the type described in which the bed during itsworking and return strokes is reciprocated in a plane, comprising thecombination with the bed and means for supporting the same for planarmovement, of a main drive shaft adapted to be rotated at a uniformangular velocity from a suitable source of power, a crank on said driveshaft, a planet pinion rotatably carried by the free end of said crank,an internally toothed sun gear about which said planet pinion is adaptedto roll, a crank pin carried by said pinion at a point spaced from itscenter, and transmission means for appplying the movement of said crankpin to the bed, a gear secured to said drive shaft, another gearrotatably mounted in said supporting means, and a crank connectionbetween said last named gear and the sun gear whereby the latter may beoscillated periodically during the cycle of movement of the bed motionto modify the motion developed by the crank pin and transmitted to thebed, whereby the bed is caused to move at a substantially constantlinear velocity during the greater portion of at least one of itsstrokes.

16. A bed movement of the type described in which the bed during itsworking and return strokes is reciprocated in a plane, comprising thecombination with the bed and means for supporting the same for planarmovement, of a main drive shaft adapted to be rotated at a uniformangular velocity from a suitable source of power, a crank on said driveshaft, a planet pinion rotatably carried by the free end of said crank,an externally toothed sun gear about which said planet pinion is adaptedto roll, a crank pin carried by said pinion at a point spaced from itscenter, and transmission means for applying the movement of said crankpin to the bed, a gear secured to said drive shaft, another gearrotatably mounted in said supporting means, and a crank connectionbetween said last named gear and the sun gear whereby the latter may beoscillated periodically during the cycle of movement of the bed motionto modify the motion developed by the crank pin and transmitted to thebed, whereby the bed is caused to move at a substantially constantlinear velocity during the greater portion of at least one of itsstrokes, the ratio of the sun gear to the planet pinion being 2:1 andthe ratio of the gear carried by the drive shaft to the gear rotatablycarried by the supporting means being 3:1.

1'7. A bed movement of the type described in which the bed during itsworking and return strokes is reciprocated in a plane, comprising thecombination with the bed and means for supporting the same for planarmovement, of a main drive shaft adapted to be rotated at a uniformangular velocity from a suitable source of power, a crank on said driveshaft, a planet pinion rotatably carried by the free end of said crank,an externally toothed sun gear about which said planet pinion is adaptedto roll, a crank pin carried by said pinion at a point spaced from itscenter, and transmission means for applying the movement of said crankpin to the bed, a gear secured to said drive shaft, another gearrotatably mounted in said supporting means, and a crank connectionbetween said last named gear and the sun gear whereby the latter may beoscillated periodically during the cycle of movement of the bed motionto modify the motion developed by the crank pin and transmitted to thebed, whereby the bed is caused to move at a substantially constantlinear velocity during the greater portion of at least one of itsstrokes, the ratio of the sun gear to the planet pinion being 2:1 andthe ratio of the gear carried by the drive shaft to the gear rotatablycarried by the supporting means being 3:1, and the length of the crankarm of the first named crank pin is 5.7% of the length of the arm of thefirst named crank.

18. In a bed motion of the class described, in combination, a supportingframe, a main drive shaft extending through portions of said frame,

a planetary system actuated by said drive shaft and including a sun gearconcentric with and surrounding said drive shaft, an annular hub on saidsun gear Within Which said drive shaft bears and which in turn has abearing in said frame,v

and gearing driven by said shaft and operatively connected with said sungear for applying periodic oscillations thereto to modify the motiondeveloped by said planetary system.

19. In a printing press of the'reciprocating bed and rotary impressioncylinder type, in combination, a supporting frame, a type bedmounted insaid frame for rectilinear reciprocation, means for driving said bedthrough successive cycles of variable linear speeds, the greater portionof the printing stroke of the bed being at a uniform velocitycorresponding with that of the impression cylinder, said meanscomprising a main drive shaft adapted to be driven at a uniform angularvelocity, a train of gears operatively interposed between Said shaft andsaid impression cylinder, a crank on said drive shaft, a planet pinionrotatably carried by the free end of said crank, a sun gear about whichsaid planet lpinion is adapted to roll, a crank pin carried by saidpinion at a point spaced from its center,

, and transmission means for applying the movement of said crank pin tothe bed, a gear secured to said drive shaft, another gear rotatablymounted in said supporting means, and a crank connection between saidlast named gear and the sun gear whereby the latter may be oscillatedperiodically during the cycle 0i movement of the bed motion to modifythe motion developed by the crank pin and transmitted to the bed,Whereby the bed is caused to move at a substantially constant linearvelocity during the greater portion of at least one of its strokes.

FREDERICK W. SEYBOLD.l

